Showing papers by "Mark L. Dietz published in 2005"
TL;DR: Partitioning of sodium ions between aqueous nitrate media and 1-alkyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imides (Cnmim+Tf2N−) in the presence of dicyclohexano-18-crown-6 is shown in this paper.
168 citations
TL;DR: In this article, tri-n-butyl phosphate (TBP) was shown to increase the extraction of strontium from acidic nitrate media into certain 1-alkyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imides by dicyclohexano-18-crown-6 (DCH18C6).
87 citations
TL;DR: The findings demonstrate that nanostructured, ionic liquid-based gels can be used to template the formation of new nanoparticle morphologies with technologically important optical, electronic, and catalytic properties.
Abstract: Photochemical reduction of tetrachloroaurate (AuCl4-) ions in the highly constrained aqueous domains of a nanostructured ionogel template, formed via self-assembly of the ionic liquid 1-decyl-3-methylimidazolium chloride (C10mim+Cl-) in water, results in the formation of anisotropic gold nanoparticles with a variety of sizes and morphologies, which include previously unattainable trigonal prismatic nanorods. Unexpectedly, small-angle X-ray scattering studies of the Au-ionogel composite reveal that the in situ formation of the nanoparticles increases the mesoscopic order of the ionogel, which results in its conversion to a near-monodomain structure. The findings demonstrate that nanostructured, ionic liquid-based gels can be used to template the formation of new nanoparticle morphologies with technologically important optical, electronic, and catalytic properties. It may also be possible to design soft templates that permit the fabrication of highly ordered nanoparticle array-hydrogel composites, thereby enabling control and tuning of the collective properties of the encapsulated nanoparticles.
86 citations
TL;DR: The determination of radiostrontium in biological and environmental samples generally requires its preliminary separation and preconcentration, both to remove radionuclides that may interfere with human health and environmental monitoring as discussed by the authors.
Abstract: The determination of radiostrontium in biological and environmental samples generally requires its preliminary separation and preconcentration, both to remove radionuclides that may interfere with ...
28 citations
TL;DR: In this article, the supercritical carbon dioxide solubilities of two series of symmetrically substituted alkylenediphosphonic acids, bearing 2.ethylhexyl and 3.trimethylsilyl−1.propyl ester groups, respectively, were determined as a function of the number of methylene groups separating the two phosphorus atoms.
Abstract: Using a dynamic flow method, the supercritical carbon dioxide (SC‐CO2) solubilities of two series of symmetrically substituted alkylenediphosphonic acids, bearing 2‐ethylhexyl and 3‐trimethylsilyl‐1‐propyl ester groups, respectively, were determined as a function of the number of methylene groups separating the two phosphorus atoms. An even–odd effect, similar to that observed previously for the aggregation of these compounds in nonpolar diluents, was observed, with compounds that form more highly aggregated species in nonpolar diluents exhibiting lower solubility in SC‐CO2. Differences in the relative solubilities of analogous members of these series prompted the study of the SC‐CO2 solubilities of symmetrically substituted methylenediphosphonic acids bearing seven‐ and eight‐carbon ester groups of various degrees of branching to determine the relative importance of steric and electronic effects in determining SC‐CO2 solubilities. When molecular connectivity indices were used to quantify the ext...
3 citations